weixin_33739646 2015-12-19 13:18 采纳率: 0%
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顺序嵌套Ajax

I am trying to achieve run a few functions which have ajax calls inside, In sequence. I am not able to do this asynchronously since they both start at the same time.

This is my code :

function engine_start() {
    a1();
    a2();
}

a1() {
    $.ajax(
        url: // some code and url
    }).then(function(data) {
    if (some_condition()) {
        console.log("finished a1. success");
    }
});
};

a2() {
    $.ajax(
        url: // some code and url
    }).then(function(data) {
    if (some_condition()) {
        console.log("finished a2. success");
    }
});
};

I want a2() to execute only after a1() is successful, which in my case is at finished a1. success . Note some_condition() also contains internal ajax requests so I need to take care of that too.

So My ideal run would be something like this :

1) engine_start()
2) a1 starts executing. 
3) a1 finishes 
4) a2 starts executing.
5) a2 finishes
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1条回答 默认 最新

  • 斗士狗 2015-12-19 13:21
    关注

    You should use some sort of callback mechanism.

    function engine_start() {
        a1(a2);
    }
    
    a1(callback) {
        $.ajax(
            url: // some code and url
        }).then(function(data) {
        if (some_condition()) {
            console.log("finished a1. success");
            callback(); // Will execute a2 when a1 is done executing.
        }
    });
    };
    
    a2() {
        $.ajax(
            url: // some code and url
        }).then(function(data) {
        if (some_condition()) {
            console.log("finished a2. success");
        }
    });
    };
    
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